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Finding the Fourth Proportional to 199.77, 299.53 and 77.89

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Solution

The fourth proportional to 199.77, 299.53 and 77.89 is: 116.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.77 : 299.53 = 77.89 : x
  2. Step 2: Convert to fraction form
    199.77/299.53 = 77.89/x
  3. Step 3: Cross multiply
    199.77x = 299.53 × 77.89
  4. Step 4: Simplify right side
    199.77x = 23,329.46
  5. Step 5: Solve for x
    x = 23,329.46/199.77
  6. Step 6: Final answer
    x = 116.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.